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<title>class Psych::ScalarScanner - psych: Ruby Standard Library Documentation</title>


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  <h3>Methods</h3>

  <ul class="link-list" role="directory">
    <li ><a href="#method-c-new">::new</a>
    <li ><a href="#method-i-parse_int">#parse_int</a>
    <li ><a href="#method-i-parse_time">#parse_time</a>
    <li ><a href="#method-i-tokenize">#tokenize</a>
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    <div id='extraz'><div class='adzbox-index'  >
      
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    <main role="main" aria-labelledby="class-Psych::ScalarScanner">
    <h1 id="class-Psych::ScalarScanner" class="class">
      class Psych::ScalarScanner
    </h1>

    <section class="description">
    
<p>Scan scalars for built in types</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">


      <section class="constants-list">
      <header>
      <h3>Constants</h3>
      </header>
      <dl>
          <dt id="FLOAT">FLOAT
          <dd><p>Taken from <a href="http://yaml.org/type/float.html">yaml.org/type/float.html</a> Base 60, [-+]inf and NaN are handled separately</p>
          <dt id="INTEGER_LEGACY">INTEGER_LEGACY
          <dd><p>Same as above, but allows commas. Not to YML spec, but kept for backwards compatibility</p>
          <dt id="INTEGER_STRICT">INTEGER_STRICT
          <dd><p>Taken from <a href="http://yaml.org/type/int.html">yaml.org/type/int.html</a></p>
          <dt id="TIME">TIME
          <dd><p>Taken from <a href="http://yaml.org/type/timestamp.html">yaml.org/type/timestamp.html</a></p>
        </dl>
        </section>

        <section class="attribute-method-details" class="method-section">
        <header>
        <h3>Attributes</h3>
        </header>

          <div id="attribute-i-class_loader" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">class_loader</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
              </div>
            </div>
            </section>


                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(class_loader, strict_integer: false)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Create a new scanner</p>

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File psych/lib/psych/scalar_scanner.rb, line 30</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span> <span class="ruby-identifier">class_loader</span>, <span class="ruby-value">strict_integer:</span> <span class="ruby-keyword">false</span>
  <span class="ruby-ivar">@symbol_cache</span> = {}
  <span class="ruby-ivar">@class_loader</span> = <span class="ruby-identifier">class_loader</span>
  <span class="ruby-ivar">@strict_integer</span> = <span class="ruby-identifier">strict_integer</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-parse_int" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">parse_int</span><span
                                class="method-args">(string)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Parse and return an int from <code>string</code></p>

                              <div class="method-source-code" id="parse_int-source">
            <pre><span class="ruby-comment"># File psych/lib/psych/scalar_scanner.rb, line 109</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">parse_int</span> <span class="ruby-identifier">string</span>
  <span class="ruby-constant">Integer</span>(<span class="ruby-identifier">string</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-string">&#39;,_&#39;</span>))
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-parse_time" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">parse_time</span><span
                                class="method-args">(string)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Parse and return a Time from <code>string</code></p>

                              <div class="method-source-code" id="parse_time-source">
            <pre><span class="ruby-comment"># File psych/lib/psych/scalar_scanner.rb, line 115</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">parse_time</span> <span class="ruby-identifier">string</span>
  <span class="ruby-identifier">klass</span> = <span class="ruby-identifier">class_loader</span>.<span class="ruby-identifier">load</span> <span class="ruby-string">&#39;Time&#39;</span>

  <span class="ruby-identifier">date</span>, <span class="ruby-identifier">time</span> = <span class="ruby-operator">*</span>(<span class="ruby-identifier">string</span>.<span class="ruby-identifier">split</span>(<span class="ruby-regexp">/[ tT]/</span>, <span class="ruby-value">2</span>))
  (<span class="ruby-identifier">yy</span>, <span class="ruby-identifier">m</span>, <span class="ruby-identifier">dd</span>) = <span class="ruby-identifier">date</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/^(-?\d{4})-(\d{1,2})-(\d{1,2})/</span>).<span class="ruby-identifier">captures</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">x</span><span class="ruby-operator">|</span> <span class="ruby-identifier">x</span>.<span class="ruby-identifier">to_i</span> }
  <span class="ruby-identifier">md</span> = <span class="ruby-identifier">time</span>.<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/(\d+:\d+:\d+)(?:\.(\d*))?\s*(Z|[-+]\d+(:\d\d)?)?/</span>)

  (<span class="ruby-identifier">hh</span>, <span class="ruby-identifier">mm</span>, <span class="ruby-identifier">ss</span>) = <span class="ruby-identifier">md</span>[<span class="ruby-value">1</span>].<span class="ruby-identifier">split</span>(<span class="ruby-string">&#39;:&#39;</span>).<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">x</span><span class="ruby-operator">|</span> <span class="ruby-identifier">x</span>.<span class="ruby-identifier">to_i</span> }
  <span class="ruby-identifier">us</span> = (<span class="ruby-identifier">md</span>[<span class="ruby-value">2</span>] <span class="ruby-operator">?</span> <span class="ruby-constant">Rational</span>(<span class="ruby-node">&quot;0.#{md[2]}&quot;</span>) <span class="ruby-operator">:</span> <span class="ruby-value">0</span>) <span class="ruby-operator">*</span> <span class="ruby-value">1000000</span>

  <span class="ruby-identifier">time</span> = <span class="ruby-identifier">klass</span>.<span class="ruby-identifier">utc</span>(<span class="ruby-identifier">yy</span>, <span class="ruby-identifier">m</span>, <span class="ruby-identifier">dd</span>, <span class="ruby-identifier">hh</span>, <span class="ruby-identifier">mm</span>, <span class="ruby-identifier">ss</span>, <span class="ruby-identifier">us</span>)

  <span class="ruby-keyword">return</span> <span class="ruby-identifier">time</span> <span class="ruby-keyword">if</span> <span class="ruby-string">&#39;Z&#39;</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">md</span>[<span class="ruby-value">3</span>]
  <span class="ruby-keyword">return</span> <span class="ruby-identifier">klass</span>.<span class="ruby-identifier">at</span>(<span class="ruby-identifier">time</span>.<span class="ruby-identifier">to_i</span>, <span class="ruby-identifier">us</span>) <span class="ruby-keyword">unless</span> <span class="ruby-identifier">md</span>[<span class="ruby-value">3</span>]

  <span class="ruby-identifier">tz</span> = <span class="ruby-identifier">md</span>[<span class="ruby-value">3</span>].<span class="ruby-identifier">match</span>(<span class="ruby-regexp">/^([+\-]?\d{1,2})\:?(\d{1,2})?$/</span>)[<span class="ruby-value">1</span><span class="ruby-operator">..</span><span class="ruby-value">-1</span>].<span class="ruby-identifier">compact</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">digit</span><span class="ruby-operator">|</span> <span class="ruby-constant">Integer</span>(<span class="ruby-identifier">digit</span>, <span class="ruby-value">10</span>) }
  <span class="ruby-identifier">offset</span> = <span class="ruby-identifier">tz</span>.<span class="ruby-identifier">first</span> <span class="ruby-operator">*</span> <span class="ruby-value">3600</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">offset</span> <span class="ruby-operator">&lt;</span> <span class="ruby-value">0</span>
    <span class="ruby-identifier">offset</span> <span class="ruby-operator">-=</span> ((<span class="ruby-identifier">tz</span>[<span class="ruby-value">1</span>] <span class="ruby-operator">||</span> <span class="ruby-value">0</span>) <span class="ruby-operator">*</span> <span class="ruby-value">60</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">offset</span> <span class="ruby-operator">+=</span> ((<span class="ruby-identifier">tz</span>[<span class="ruby-value">1</span>] <span class="ruby-operator">||</span> <span class="ruby-value">0</span>) <span class="ruby-operator">*</span> <span class="ruby-value">60</span>)
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">klass</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">yy</span>, <span class="ruby-identifier">m</span>, <span class="ruby-identifier">dd</span>, <span class="ruby-identifier">hh</span>, <span class="ruby-identifier">mm</span>, <span class="ruby-identifier">ss</span><span class="ruby-operator">+</span><span class="ruby-identifier">us</span><span class="ruby-operator">/</span>(<span class="ruby-value">1_000_000r</span>), <span class="ruby-identifier">offset</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-tokenize" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">tokenize</span><span
                                class="method-args">(string)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Tokenize <code>string</code> returning the Ruby object</p>

                              <div class="method-source-code" id="tokenize-source">
            <pre><span class="ruby-comment"># File psych/lib/psych/scalar_scanner.rb, line 37</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">tokenize</span> <span class="ruby-identifier">string</span>
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">nil</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">empty?</span>
  <span class="ruby-keyword">return</span> <span class="ruby-ivar">@symbol_cache</span>[<span class="ruby-identifier">string</span>] <span class="ruby-keyword">if</span> <span class="ruby-ivar">@symbol_cache</span>.<span class="ruby-identifier">key?</span>(<span class="ruby-identifier">string</span>)
  <span class="ruby-identifier">integer_regex</span> = <span class="ruby-ivar">@strict_integer</span> <span class="ruby-operator">?</span> <span class="ruby-constant">INTEGER_STRICT</span> <span class="ruby-operator">:</span> <span class="ruby-constant">INTEGER_LEGACY</span>
  <span class="ruby-comment"># Check for a String type, being careful not to get caught by hash keys, hex values, and</span>
  <span class="ruby-comment"># special floats (e.g., -.inf).</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">%r{^[^\d.:-]?[[:alpha:]_\s!@#$%\^&amp;*(){}&lt;&gt;|/\\~;=]+}</span>) <span class="ruby-operator">||</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/\n/</span>)
    <span class="ruby-keyword">return</span> <span class="ruby-identifier">string</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">&gt;</span> <span class="ruby-value">5</span>

    <span class="ruby-keyword">if</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^[^ytonf~]/i</span>)
      <span class="ruby-identifier">string</span>
    <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span> <span class="ruby-operator">==</span> <span class="ruby-string">&#39;~&#39;</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^null$/i</span>)
      <span class="ruby-keyword">nil</span>
    <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^(yes|true|on)$/i</span>)
      <span class="ruby-keyword">true</span>
    <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^(no|false|off)$/i</span>)
      <span class="ruby-keyword">false</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">string</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-constant">TIME</span>)
    <span class="ruby-keyword">begin</span>
      <span class="ruby-identifier">parse_time</span> <span class="ruby-identifier">string</span>
    <span class="ruby-keyword">rescue</span> <span class="ruby-constant">ArgumentError</span>
      <span class="ruby-identifier">string</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^\d{4}-(?:1[012]|0\d|\d)-(?:[12]\d|3[01]|0\d|\d)$/</span>)
    <span class="ruby-identifier">require</span> <span class="ruby-string">&#39;date&#39;</span>
    <span class="ruby-keyword">begin</span>
      <span class="ruby-identifier">class_loader</span>.<span class="ruby-identifier">date</span>.<span class="ruby-identifier">strptime</span>(<span class="ruby-identifier">string</span>, <span class="ruby-string">&#39;%F&#39;</span>, <span class="ruby-constant">Date</span><span class="ruby-operator">::</span><span class="ruby-constant">GREGORIAN</span>)
    <span class="ruby-keyword">rescue</span> <span class="ruby-constant">ArgumentError</span>
      <span class="ruby-identifier">string</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^\+?\.inf$/i</span>)
    <span class="ruby-constant">Float</span><span class="ruby-operator">::</span><span class="ruby-constant">INFINITY</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^-\.inf$/i</span>)
    <span class="ruby-operator">-</span><span class="ruby-constant">Float</span><span class="ruby-operator">::</span><span class="ruby-constant">INFINITY</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^\.nan$/i</span>)
    <span class="ruby-constant">Float</span><span class="ruby-operator">::</span><span class="ruby-constant">NAN</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^:./</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">string</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp">/^:([&quot;&#39;])(.*)\1/</span>
      <span class="ruby-ivar">@symbol_cache</span>[<span class="ruby-identifier">string</span>] = <span class="ruby-identifier">class_loader</span>.<span class="ruby-identifier">symbolize</span>(<span class="ruby-node">$2</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp">/^:/</span>, <span class="ruby-string">&#39;&#39;</span>))
    <span class="ruby-keyword">else</span>
      <span class="ruby-ivar">@symbol_cache</span>[<span class="ruby-identifier">string</span>] = <span class="ruby-identifier">class_loader</span>.<span class="ruby-identifier">symbolize</span>(<span class="ruby-identifier">string</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp">/^:/</span>, <span class="ruby-string">&#39;&#39;</span>))
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^[-+]?[0-9][0-9_]*(:[0-5]?[0-9]){1,2}$/</span>)
    <span class="ruby-identifier">i</span> = <span class="ruby-value">0</span>
    <span class="ruby-identifier">string</span>.<span class="ruby-identifier">split</span>(<span class="ruby-string">&#39;:&#39;</span>).<span class="ruby-identifier">each_with_index</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">n</span>,<span class="ruby-identifier">e</span><span class="ruby-operator">|</span>
      <span class="ruby-identifier">i</span> <span class="ruby-operator">+=</span> (<span class="ruby-identifier">n</span>.<span class="ruby-identifier">to_i</span> <span class="ruby-operator">*</span> <span class="ruby-value">60</span> <span class="ruby-operator">**</span> (<span class="ruby-identifier">e</span> <span class="ruby-operator">-</span> <span class="ruby-value">2</span>).<span class="ruby-identifier">abs</span>)
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">i</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/^[-+]?[0-9][0-9_]*(:[0-5]?[0-9]){1,2}\.[0-9_]*$/</span>)
    <span class="ruby-identifier">i</span> = <span class="ruby-value">0</span>
    <span class="ruby-identifier">string</span>.<span class="ruby-identifier">split</span>(<span class="ruby-string">&#39;:&#39;</span>).<span class="ruby-identifier">each_with_index</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">n</span>,<span class="ruby-identifier">e</span><span class="ruby-operator">|</span>
      <span class="ruby-identifier">i</span> <span class="ruby-operator">+=</span> (<span class="ruby-identifier">n</span>.<span class="ruby-identifier">to_f</span> <span class="ruby-operator">*</span> <span class="ruby-value">60</span> <span class="ruby-operator">**</span> (<span class="ruby-identifier">e</span> <span class="ruby-operator">-</span> <span class="ruby-value">2</span>).<span class="ruby-identifier">abs</span>)
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">i</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-constant">FLOAT</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-regexp">/\A[-+]?\.\Z/</span>)
      <span class="ruby-identifier">string</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-constant">Float</span>(<span class="ruby-identifier">string</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-string">&#39;,_&#39;</span>).<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">/\.([Ee]|$)/</span>, <span class="ruby-string">&#39;\1&#39;</span>))
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">string</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-identifier">integer_regex</span>)
    <span class="ruby-identifier">parse_int</span> <span class="ruby-identifier">string</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">string</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
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